// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

#include "udf_samples/udf_sample.h"

namespace doris_udf {

// ---------------------------------------------------------------------------
// This is a sample of implementing a COUNT aggregate function.
// ---------------------------------------------------------------------------
void CountInit(FunctionContext* context, BigIntVal* val) {
    val->is_null = false;
    val->val = 0;
}

void CountUpdate(FunctionContext* context, const IntVal& input, BigIntVal* val) {
    if (input.is_null) return;
    ++val->val;
}

void CountMerge(FunctionContext* context, const BigIntVal& src, BigIntVal* dst) {
    dst->val += src.val;
}

BigIntVal CountFinalize(FunctionContext* context, const BigIntVal& val) {
    return val;
}

}
